In my opinion, it's all in the carto itself. I've never had a tank interfere with VTF unless it just flat out wasn't wicking from the tank. These days, I'm much more into RDA/RBA *but* when I do reach for one of my carto tanks, it's a tank using an Ikenvape carto. Give them a try if you haven't already:
Products just be aware that the stock comes and goes fairly quickly so if you find a model you like, get 15 or 20 when you can...